Device for finishing concrete pavements



L. ASHMORE AND H. R. POWELL. DEVICE FOR FINISHING CONCRETE PAVEMENTS.

APPLICATION FILED JULY 25.1919.

Patented Jan. 4, 1921.

Z SHEETSSHEET 1.

w. L. ASHMORE AND H. R. POWELL.

. DEVICE FOR FINISHING CONCRETE PAVEMENTS I I APPLICATION FILED JULY 25. I9I9. 1,3 4, 05, Patented Jan. 4,1921.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

WALTER L. ASHMORE AND HOMER R. POWELL, OF MACCTT, GEORGIA DEVICE. FOR FINISHING CONCRETE PAVEMENTS.

To all whom it may concern:

Be it known that we, WLALTER L. AsH- MORE and HOMER R. POWELL, citizens of the United States, residing at Macon, in the county of Bibb and State of Georgia, have invented certain new and useful Improvements in Devices for Finishing Concrete Pavements; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will en-' able others skilled in the art to which it appertains to make and use the same.

This invention relates to means for rolling,

' smoothing and finishing concrete, pavements and the like and more particularly to rolling devices adapted to produce a tamping effect when moved over the surface of concrete which is spread over the road bed as it comes from the mixing machine.

The primary object of our invention is to provide a simple and efficient rolling device of the character'referred to having means to effect a tamping action as it is drawn or moved to and fro over the surface of the concrete mass.

The invention will first be hereinafter more particularly described, with reference to the accompanying drawings, which a e to be taken as a part of this specification, and then pointed out in the claims at the end ofthe description.

fin said drawings, Figure 1 is a plan view of a rolling and tamping device embodying our invention;

Fig. 2 is a front view of the same;

Fig. 3 is a side view thereof, not showing the engine;

Fig 4 is a vertical longitudinal sectional view illustrating a modification of the invention.

' Fig. '5 is a side view of another modifica tion, and Fig. 6 is a front view, partly in section, of the device shown in Fig. 5.

. 0 Referring to said drawings, in which the same reference letters are used to denote correspondingparts in different views, the letters A, A and A denote the front, rear and side plates, respectively, of a' supporting frame, having journaled therein a group of rollers B, B and B which are preferably of the type shown in Letters Patent No. 1,273,022, issued July 16, 1918, to W. L. Ashmore and W. T. Morgan, J r., for a process and device for finishing concrete pavements. The rollers are preferably hollow and are Specificationof Letters Patent.

Patented Jan. 4, 1921.

Application filed July 25, 1919. Serial No.\313,171.

of small diameter and relatively great length and llght weight, to adapt the device to float on oversaturated concrete and to act on the surface thereof as a straight edge, for straightenmg and smoothing such surface. These rollers may have axles which extend therethrough or stub shafts j ournaled in suitable bearmgs in the side plates A of the supportlng frame, said side plates being preferably constructed of thin sheet metal or steel, bolted or otherwise secured to similar front andrear plates so, as to form a square or rectangular frame. Said frame, in the form shown in Figs. 1 to 3, is constructed in two sectlons which are hinged together at an intermediate point, coincident with the axis of theintermediate roller B so as to adapt the latter roller to move upwardly and downwardly asthe device is moved over the surface of the paving material. The letter C denotes a gas engine mounted on the supporting frame, preferably a two-cycle eng ne having a reciprocating piston with a plston rod having its free end pivotally attached to a crank or crank arms on a crankshaft D, having pinions d thereon in mesh with pinions or ear wheels 6 on the inner ends of shafts E, which have cranks e on their outer ends carrying studs or pins 6 from which are suspended-connecting rods or bars F, the lower ends of which have eyes to receive the projecting ends of the roller shaft, or stub shafts projecting from the heads of the intermediate roller B and on which the two sections of the supporting frame are hinged, so that by the rotation of the crank shaft D and with it the crank shafts E, E a reciprocatory movement will be imparted to the connecting rods F, thereby raising and lowering the, center of the hinged frame and with it the intermediate roller, once during each revolution of the crank shaft or each reciprocating movement of the piston of the gas engine. This movement tends to draw the two outside or front and rear rollers together or toward each other, and at the same time, as the intermediate roller is lifted, throws the entire thrust of the weight on said outside rollers; thus producing a pinching or kneading effect on the paving material, while the downward thrust or movement of the intermediate roller has a tamping effect, thus causing the coarse aggregate or heavier particles to particles are caused to rise to the surface sufficiently to form a smooth finishedpavement.

For tamping very stiff concrete or brick pavements and other tamping work, We detach the middle roller B and substitute therefor a tamping bar B (Fig. 4), which is supported and actuated or lifted and depressed sucessively in the same manner and by the means hereinbefore described for operating the intermediate tamping roller. Otherwise the construction of the rolling and tamping, device shown in Fig. 4 is essentially the same as described with reference to the construction and arrangement of parts shown in Figs. 1 to 3. In the modifications shown in Figs. 5 and 6, a rigid or inflexible frame is employed n and the intermediate roller has its axle ends or stub shafts on the roller heads projecting through Vertically disposed elongated slots 9 in the side barsA of the supporting frame, to allow vertical movement of the intermediate roller, which may be raised and lowered or lifted and depressed by connecting the rods F with the axle ends or stub shafts of said roller in the manner shown and described with reference to Figs. 1 to 3 of the drawings, but in this instance we have 80 shown an engine provided with a fly wheel or crank-shaft, which is connected by a rod 71, with the inner ends of a pair of levers H, H, which are fulcrumed on standards I on the supporting frame and have connecting rods F suspended from their free ends, said rods F being provided at their lower ends with apertures to receive the ends of the roller-shaft or axle or stub shafts projecting fromthe roller heads of the intermediate roller, whereby the latter roller may be lifted and depressed once during each revolution of the crank shaft of the engine, thus forming a tamp of the middle roller.

For the purpose of propelling or drawing the rolling device over thesurface of the paving material, it may be provided with a long handle, or two handles, one projecting from the front and another from the rear thereof, but preferably a rope is attached to each end or the front and rear of the-carriage or supporting frame whereby it may be pulled across the street or back and forth over the surface of the paving material by an operator at each edge of the pavement, so as to avoid the necessity for and prevent the operator from standing on the freshlylaid concrete, which tends toform mortar pockets by the feet pressing the coarse aggregate down lower than the surrounding 60 surface. F The oper 'on'and advantagesof our invention will e readily understood from the foregoing description. saturated concrete being spread over the road bed as it comes from the-mixing ma- Freshly laid overto develop check cracks and is more compact and durable than concrete pavements as .75

heretofore ordinarily constructed.

The described movement of'the rollers, in addition to the direct blow or tamping effect of the middle roller, greatly expedites the v progress of the work of tamping and finishmg the pavement. While specially designed for use in smoothing and finishing concrete pavements, in which oversaturated concrete is used, the device is scapable of use on other types of pavements, and particularly on what is known as monolthic brick pavements.

Having thus described our invention, what we claim is:

1. A device for rolling and tamping concrete pavements, comprising a group of rollers journaled in a supporting frame having front and rear sections hinged together, an intermediate vertically movable roller, and

a motor on said frame connected to and adapted toimpart a rapid upward. and downward movement to the intermediate roller.

2. A device for rolling and tamping concrete pavements, comprising a group of rollers journaled in a supporting frame, said frame having flexibly connected front and rear sections, one of the intermediate rollers being movable vertically while moving horizontally over the surface of the concrete, and a motor and means on said frame adapted to cause said movable roller to "move quickly up and down so as to effect a tamping action thereof. i

3. The ,combinationin a device for-rolling and tamping paving material, of a frame having front and rear flexibly connected sections and having threeroll'er's, journaled therein, the intermediate roller being mow. able upwardlvand downwardly at the point of flexure o the frame aslthe dev ce is moved over the surfaceof the paving material, and a motor mounted on said, frame having a piston and connections'zbetween said piston and said intermediate" roller whereby the roller is rapidly lifted and' depressed so as to effect a tamping action as it is moved'over said surface. a

p .4. A device for finishing-and smoothing concrete pavements, 'com-prlsing a. group of 126 rollers journaled in a supportingframe, said frame being; hinged at an intermediate point with provision for 'verticalre'ciprocatory movement thereof, one roller being arranged at said point, a motor mounted on said 130 frame, and connections between said motor and said intermediate roller adapted to effect an upward and downward movement or' tamping action thereof as the machine is moved to and fro over the surface of the concrete.

' having front and rear sections hinged together 0n a line passing through said midway roller, a motor on said frame, and connections between said motor and supporting frame whereby said midway roller is 'ifted and depressed in rapid succession so as to effect a tamping action thereof as the device is moved over the surfaceof the concrete.

6. A device for finishing pavements com prising several rollers of small diameter and ers, and'said frame having front and rear sections hinged together at said intermediate point, a motor on said frame, and means connecting said motor and frame whereby the intermediate portion of the fr'ame;and

with itthe intermediate roller may be raised and lowered in such manner as to effect a kneading action on the paving. material and a tam ing action of the intermediate roller.

7. ii device for rolling, tamping and finishing concrete and other pavements, comprising a frame having front and rear flexibly connected sections and carrying a plurality of rollers and a vertically movable roller or tamping device arranged between front and rear rollers, a motor'carried by said frame, and means actuated by said motor for imparting an upward and downward movement to said tamping device.

In testimony whereof we afiix our signatures in the presence of two witnesses.

WALTER L; A SHMORE. HOMER R. POWELL. Witnesses:

L. D. MOORE, P. G. HOGAN. 

